nrf5/examples: Adding ubluepy peripheral example that works across nrf51 and nrf52. The example uses Environmenting Sensing Service to provide the temperature characteristic. The temperature is fetched from the machine.Temp module. One note is that the example uses 1 LED which is not present on all boards.

nrf5/examples/ubluepy_temp.py

@@ -0,0 +1,92 @@
+# This file is part of the Micro Python project, http://micropython.org/
+#
+# The MIT License (MIT)
+#
+# Copyright (c) 2017 Glenn Ruben Bakke
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE
+
+from pyb import LED
+from machine import RTC, Temp
+from ubluepy import Service, Characteristic, UUID, Peripheral, constants
+
+def event_handler(id, handle, data):
+    global rtc
+    global periph
+    global serv_env_sense
+    global notif_enabled
+ 
+    if id == constants.EVT_GAP_CONNECTED:
+        # indicated 'connected'
+        LED(1).on()
+
+    elif id == constants.EVT_GAP_DISCONNECTED:
+        # stop low power timer
+        rtc.stop()
+        # indicate 'disconnected'
+        LED(1).off()
+        # restart advertisment
+        periph.advertise(device_name="micr_temp", services=[serv_env_sense])
+
+    elif id == constants.EVT_GATTS_WRITE:
+        # write to this Characteristic is to CCCD
+        if int(data[0]) == 1:
+            notif_enabled = True
+            # start low power timer
+            rtc.start()
+        else: 
+            notif_enabled = False
+            # stop low power timer
+            rtc.stop()
+
+def send_temp(timer_id):
+    global notif_enabled
+    global char_temp
+
+    if notif_enabled:
+        # measure chip temperature
+        temp = Temp.read()
+        temp =  temp * 100
+        char_temp.write(bytearray([temp & 0xFF, temp >> 8]))
+
+# start off with LED(1) off
+LED(1).off()
+
+# use RTC1 as RTC0 is used by bluetooth stack 
+# set up RTC callback every 5 second
+rtc = RTC(1, period=5, mode=RTC.PERIODIC, callback=send_temp)
+
+notif_enabled = False
+
+uuid_env_sense = UUID("0x181A") # Environmental Sensing service
+uuid_temp = UUID("0x2A6E") # Temperature characteristic
+ 
+serv_env_sense = Service(uuid_env_sense)
+
+temp_props = Characteristic.PROP_NOTIFY | Characteristic.PROP_READ
+temp_attrs = Characteristic.ATTR_CCCD
+char_temp = Characteristic(uuid_temp, props = temp_props, attrs = temp_attrs)
+
+serv_env_sense.addCharacteristic(char_temp)
+
+periph = Peripheral()
+periph.addService(serv_env_sense)
+periph.setConnectionHandler(event_handler)
+periph.advertise(device_name="micr_temp", services=[serv_env_sense])
+